Question about 1987 Jeep Cherokee

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Drove home last night parked then this morning would not start no spark from coil changed coil and icm but still no fire from coil could it be the cam postion sensor 87 jeep cherokee 4.0 inline 6

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I believe you are on the right track for this issue by suspecting the camshaft position sensor (CMP). However I would also be giving the crankshaft position sensor(CKP) equal consideration. Those two sensors communicate with the ICM to determine spark timing strategy. Th loss of either of those signals will create the condition you describe. I would probably start with the CMP because if that sensor fails the vehicle will continue to run because the ICM will calculate spark timing based off the last signal received. Then when you try to restart the engine will not fire. I believe you got a good beat on it and all I did was confirm your thought process. Hope this helped and good luck.

Posted on Mar 27, 2011

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